1/*	$NetBSD: libfdt_env.h,v 1.5 2019/12/22 12:33:17 skrll Exp $	*/
2
3/* SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause) */
4#ifndef LIBFDT_ENV_H
5#define LIBFDT_ENV_H
6/*
7 * libfdt - Flat Device Tree manipulation
8 * Copyright (C) 2006 David Gibson, IBM Corporation.
9 * Copyright 2012 Kim Phillips, Freescale Semiconductor.
10 */
11
12#if defined(_KERNEL) || defined(_STANDALONE)
13#include <sys/param.h>
14#include <sys/types.h>
15#include <lib/libkern/libkern.h>
16#else
17#include <stdbool.h>
18#include <stddef.h>
19#include <stdint.h>
20#include <stdlib.h>
21#include <string.h>
22#include <limits.h>
23#endif
24
25#ifdef __CHECKER__
26#define FDT_FORCE __attribute__((force))
27#define FDT_BITWISE __attribute__((bitwise))
28#else
29#define FDT_FORCE
30#define FDT_BITWISE
31#endif
32
33typedef uint16_t FDT_BITWISE fdt16_t;
34typedef uint32_t FDT_BITWISE fdt32_t;
35typedef uint64_t FDT_BITWISE fdt64_t;
36
37#define EXTRACT_BYTE(x, n)	((unsigned long long)((uint8_t *)&x)[n])
38#define CPU_TO_FDT16(x) ((EXTRACT_BYTE(x, 0) << 8) | EXTRACT_BYTE(x, 1))
39#define CPU_TO_FDT32(x) ((EXTRACT_BYTE(x, 0) << 24) | (EXTRACT_BYTE(x, 1) << 16) | \
40			 (EXTRACT_BYTE(x, 2) << 8) | EXTRACT_BYTE(x, 3))
41#define CPU_TO_FDT64(x) ((EXTRACT_BYTE(x, 0) << 56) | (EXTRACT_BYTE(x, 1) << 48) | \
42			 (EXTRACT_BYTE(x, 2) << 40) | (EXTRACT_BYTE(x, 3) << 32) | \
43			 (EXTRACT_BYTE(x, 4) << 24) | (EXTRACT_BYTE(x, 5) << 16) | \
44			 (EXTRACT_BYTE(x, 6) << 8) | EXTRACT_BYTE(x, 7))
45
46static inline uint16_t fdt16_to_cpu(fdt16_t x)
47{
48	return (FDT_FORCE uint16_t)CPU_TO_FDT16(x);
49}
50static inline fdt16_t cpu_to_fdt16(uint16_t x)
51{
52	return (FDT_FORCE fdt16_t)CPU_TO_FDT16(x);
53}
54
55static inline uint32_t fdt32_to_cpu(fdt32_t x)
56{
57	return (FDT_FORCE uint32_t)CPU_TO_FDT32(x);
58}
59static inline fdt32_t cpu_to_fdt32(uint32_t x)
60{
61	return (FDT_FORCE fdt32_t)CPU_TO_FDT32(x);
62}
63
64static inline uint64_t fdt64_to_cpu(fdt64_t x)
65{
66	return (FDT_FORCE uint64_t)CPU_TO_FDT64(x);
67}
68static inline fdt64_t cpu_to_fdt64(uint64_t x)
69{
70	return (FDT_FORCE fdt64_t)CPU_TO_FDT64(x);
71}
72#undef CPU_TO_FDT64
73#undef CPU_TO_FDT32
74#undef CPU_TO_FDT16
75#undef EXTRACT_BYTE
76
77#ifdef __APPLE__
78#include <AvailabilityMacros.h>
79
80/* strnlen() is not available on Mac OS < 10.7 */
81# if !defined(MAC_OS_X_VERSION_10_7) || (MAC_OS_X_VERSION_MAX_ALLOWED < \
82                                         MAC_OS_X_VERSION_10_7)
83
84#define strnlen fdt_strnlen
85
86/*
87 * fdt_strnlen: returns the length of a string or max_count - which ever is
88 * smallest.
89 * Input 1 string: the string whose size is to be determined
90 * Input 2 max_count: the maximum value returned by this function
91 * Output: length of the string or max_count (the smallest of the two)
92 */
93static inline size_t fdt_strnlen(const char *string, size_t max_count)
94{
95    const char *p = memchr(string, 0, max_count);
96    return p ? p - string : max_count;
97}
98
99#endif /* !defined(MAC_OS_X_VERSION_10_7) || (MAC_OS_X_VERSION_MAX_ALLOWED <
100          MAC_OS_X_VERSION_10_7) */
101
102#endif /* __APPLE__ */
103
104#endif /* LIBFDT_ENV_H */
105